The noun behavior has 4 senses (first 3 from tagged texts)
1. (30) behavior, behaviour, conduct, doings -- (manner of acting or controlling yourself)
2. (17) behavior, behaviour -- (the action or reaction of something (as a machine or substance) under specified circumstances; "the behavior of small particles can be studied in experiments")
3. (8) demeanor, demeanour, behavior, behaviour, conduct, deportment -- ((behavioral attributes) the way a person behaves toward other people)
4. behavior, behaviour -- ((psychology) the aggregate of the responses or reactions or movements made by an organism in any situation)